stmmac: DMA threshold mode or SF mode can be different among multiple device instance

- In tx_hard_error_bump_tc interrupt, tc should be bumped only when current
device instance is in DMA threshold mode. Check per device xstats.threshold
other than global tc.

- Set per device xstats.threshold to SF_DMA_MODE when current device
instance is set to SF mode.

v2-changes:
- fix ident style

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 9c11c4d0f3fd..55e89b3838f1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1288,7 +1288,7 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
                  *    that needs to not insert csum in the TDES.
                  */
                 priv->hw->dma->dma_mode(priv->ioaddr, SF_DMA_MODE, SF_DMA_MODE);
-                tc = SF_DMA_MODE;
+                priv->xstats.threshold = SF_DMA_MODE;
         } else
                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 }
@@ -1452,7 +1452,8 @@ static void stmmac_dma_interrupt(struct stmmac_priv *priv)
         }
         if (unlikely(status & tx_hard_error_bump_tc)) {
                 /* Try to bump up the dma threshold on this failure */
-                if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
+                if (unlikely(priv->xstats.threshold != SF_DMA_MODE) &&
+                    (tc <= 256)) {
                         tc += 64;
                         if (priv->plat->force_thresh_dma_mode)
                                 priv->hw->dma->dma_mode(priv->ioaddr, tc, tc);